关于股指期货投资者适当性制度要求，下列说法正确的是（）。

A.自然人申请开户时保证金账户可用资金余额不低于人民币50万元

B.自然人具备股指期货基础知识，开户测试不低于70分

C.自然人具有累计10个交易日、10笔以上的股指期货仿真交易成交记录

D.自然人最近一年内具有10笔以上的商品期货交易成交记录

根据短文内容及首字母提示，写出所缺单词，使短文完整.通顺。

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